1. The new laptop battery HP hdx18 is used for the first time, it should charge immediately after runing out the remaining power. And the first three necessary and sufficient to charge more than 8 hours (Don't care about 1-2 hours of charging display "battery is full" message), and try to run out of battery before recharge.
2. Please use the original external battery charger for HP hdx18 or domestic brands, try to avoid using the multi-purpose battery chargers.
3. HP hdx18 battery life of 3-5 years, can be recycled approximately 800-1000 times, lithium batteries should be replaced with 3 years.
4.Pay attention to the surrounding heat when battery charging.
5.Please take out the battery from battery compartment for long time unused, keep in a dry and cool environment. It is better to put it in the battery box to avoid short-circuit.
6. Battery should be fully charged for long tiem unused. Don't keep a long time without power. Because all of the battery have a natural "sleep" state after preserving for a long time, the HP HDX18 battery life will reduced, So please recharge the battery for every few months. If the battery has been placed for a long time, you'd batter charge battery with a slow charge for the first.
7. Usually for a 3-cell or 4-cell battery, the standby time is more than 60 minutes; a hdx18 6-cell or 8-cell battery for HP's standby time is over 150 minutes and HP hdx18 9-cell battery over 200 minutes while the HP 12-cell battery hdx18 more than 250 minutes.

HP HDX18 battery not charging when plugged in?

If your HP laptop hdx18 battery is plugged in but not charging or not recognized, what should you do now?
1. First, you should check whether HP hdx18 batteri you bought is compatible with your original battery type and your laptop model.
2. Computer's CMOS cann't identify the battery, you need to re-plug the battery, or the next computer upgrade or restore the CMOS settings, and the computer set to identify the hardware interface automatically.
3. Maybe the charging chip of computer's motherboard was damaged, it cann't charge the battery, you need to change a new chip on the motherboard.
4. You could run a BIOS UPDATE will help if you have the latest installed. HP released a BIOS update for some of hp series that fixed HDX18 battery problem.
5. HP hdx18 battery won't charge fully when zero voltage or low voltage in local circumstances. You'd better discharged the battery completely, then slow charge more than 10 hours to activate the battery.
6. Check whether the HP hdx18 laptop ac power adapter works normally, maybe this is the power cord problem. If your laptop battery will not charge, you can try jiggled the plug connection at the laptop, perhaps the cord had one loose connection at the barrel plug, it is easy to fix.
7. Maybe battery is damaged during using or transit. You need to change a new battery.
8. Maybe HP battery for HDX18 was used for a long time, HDX18 batterie life is limited, you need to change a new battery.
"If your HP HDX18 laptop external battery charger stops charging or not holding charge": The most likely, cheapest, and fastest way to solve this problem is to keep laptop plugged in and charging, turn your machine off, take out battery, restart, then reinstall the battery, turn on. Hopefully this works for everyone , if not, you honestly probably do need a new battery.